1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com/ 4 * Andrew F. Davis <afd@ti.com> 5 * 6 * Based on the TPS65912 driver 7 */ 8 9 #include <linux/gpio/driver.h> 10 #include <linux/module.h> 11 #include <linux/platform_device.h> 12 13 #include <linux/mfd/tps65086.h> 14 15 struct tps65086_gpio { 16 struct gpio_chip chip; 17 struct tps65086 *tps; 18 }; 19 20 static int tps65086_gpio_get_direction(struct gpio_chip *chip, 21 unsigned offset) 22 { 23 /* This device is output only */ 24 return 0; 25 } 26 27 static int tps65086_gpio_direction_input(struct gpio_chip *chip, 28 unsigned offset) 29 { 30 /* This device is output only */ 31 return -EINVAL; 32 } 33 34 static int tps65086_gpio_direction_output(struct gpio_chip *chip, 35 unsigned offset, int value) 36 { 37 struct tps65086_gpio *gpio = gpiochip_get_data(chip); 38 39 /* Set the initial value */ 40 regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL, 41 BIT(4 + offset), value ? BIT(4 + offset) : 0); 42 43 return 0; 44 } 45 46 static int tps65086_gpio_get(struct gpio_chip *chip, unsigned offset) 47 { 48 struct tps65086_gpio *gpio = gpiochip_get_data(chip); 49 int ret, val; 50 51 ret = regmap_read(gpio->tps->regmap, TPS65086_GPOCTRL, &val); 52 if (ret < 0) 53 return ret; 54 55 return val & BIT(4 + offset); 56 } 57 58 static void tps65086_gpio_set(struct gpio_chip *chip, unsigned offset, 59 int value) 60 { 61 struct tps65086_gpio *gpio = gpiochip_get_data(chip); 62 63 regmap_update_bits(gpio->tps->regmap, TPS65086_GPOCTRL, 64 BIT(4 + offset), value ? BIT(4 + offset) : 0); 65 } 66 67 static const struct gpio_chip template_chip = { 68 .label = "tps65086-gpio", 69 .owner = THIS_MODULE, 70 .get_direction = tps65086_gpio_get_direction, 71 .direction_input = tps65086_gpio_direction_input, 72 .direction_output = tps65086_gpio_direction_output, 73 .get = tps65086_gpio_get, 74 .set = tps65086_gpio_set, 75 .base = -1, 76 .ngpio = 4, 77 .can_sleep = true, 78 }; 79 80 static int tps65086_gpio_probe(struct platform_device *pdev) 81 { 82 struct tps65086_gpio *gpio; 83 int ret; 84 85 gpio = devm_kzalloc(&pdev->dev, sizeof(*gpio), GFP_KERNEL); 86 if (!gpio) 87 return -ENOMEM; 88 89 platform_set_drvdata(pdev, gpio); 90 91 gpio->tps = dev_get_drvdata(pdev->dev.parent); 92 gpio->chip = template_chip; 93 gpio->chip.parent = gpio->tps->dev; 94 95 ret = gpiochip_add_data(&gpio->chip, gpio); 96 if (ret < 0) { 97 dev_err(&pdev->dev, "Could not register gpiochip, %d\n", ret); 98 return ret; 99 } 100 101 return 0; 102 } 103 104 static int tps65086_gpio_remove(struct platform_device *pdev) 105 { 106 struct tps65086_gpio *gpio = platform_get_drvdata(pdev); 107 108 gpiochip_remove(&gpio->chip); 109 110 return 0; 111 } 112 113 static const struct platform_device_id tps65086_gpio_id_table[] = { 114 { "tps65086-gpio", }, 115 { /* sentinel */ } 116 }; 117 MODULE_DEVICE_TABLE(platform, tps65086_gpio_id_table); 118 119 static struct platform_driver tps65086_gpio_driver = { 120 .driver = { 121 .name = "tps65086-gpio", 122 }, 123 .probe = tps65086_gpio_probe, 124 .remove = tps65086_gpio_remove, 125 .id_table = tps65086_gpio_id_table, 126 }; 127 module_platform_driver(tps65086_gpio_driver); 128 129 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); 130 MODULE_DESCRIPTION("TPS65086 GPIO driver"); 131 MODULE_LICENSE("GPL v2"); 132